Stop means for rotary inductances



Jul 15, 1941. E, A. LEACH 2,249,479

STOP MEANS FOR ROTARY INDUCTANCES Filed Nov. 28, 1959 v Inventor: EdwardA,L..each,

, by flan/ 76i His Attor-fiey Patented this, 1941 UNITED STAT STOP S FOBROTARY INDUCTANOES Edward A. Leach, Schenectady, N. Y., mignor toGeneral Electric Company, a corporation of New York Application Novemberas. 1939. Serial No. 306.567

6 Claims.

My'invention relates to devices, such as rotary inductance coils, whichinclude a rotatably supported helical conductor or similar member and atraveling member or roller in contact with the helical member andmovable thereby longitudinaily thereof as the helical member is rotated.The invention relates particularly to means for stopping the rotation ofthe helical member after a predetermined number of revolutions thereof.

The general object of the invention is to provide 'a simple and positivestop mechanism for the helical conductor member employed in rotaryinductance coils'and the like.

A particular object is to provide a stop mechanism, for a rotatablysupported helical conductor member, in which the traveling or rollercontact member directly actuates a stop means associate with the helicalmember.

Another object is to provide an adjustment means, preferably associatedwith the traveling or roller member, whereby a final adjustment forstopping the helical member exactly in its predetermined desiredposition is readily obtained.

In the operation of rotary inductance coils and the like, having atraveler or roller in contact with a helix and moving from end to endthereof, difficulties have been encountered in the use of means to stopthe helix as the roller approached an end, and to prevent the traveleror roller from running oil the end of the helix. In certain cases thestop means heretofore employed have involved objectionable complication,and uncertainty in operation. Further, diiilculties have beenencountered in the final adjustment of the stop means.

In accordance with my present invention the foregoing and otherdifllculties are overcome, and the above-mentioned and further objectsand advantages are attained by the provision of a means for stopping.therotation of the helical member including a stop member movable withor in mechanical connection with ,the helical member, a second stopmember having one portion in the path of the traveling or roller memofarotary inductance device in which my invention has been embodied; Fig. 2is an elevational view, partially in section, of the embodimentillustrated in Fig. 1; Fig. 3 is an end elevational view, with one endplate broken away, of the embodiment illustrated in Figs. 1 and 2; andFig. 4 is an enlarged sectional view of the traveling or roller contactmember shown in Figs. 1 to 3.

Referring to Fig. 1, the numeral Hi designates a helical conductor woundon a cylindrical form i I ,rotatably mounted in a frame or supportcomprising a pair of end plates i2 and I3 and spacer rods ll. On a rod15 parallel to the axis of coil in is mounted a traveling contact memberor contact roller member it which rides on the helical conductor l0. Tomaintain the roller i6 infirm contact with the conductor l0, the rod i5is resiliently mounted on the end plates i2, i3, by springs II whichpass through the ends of the rod i5 and the ends of which rest againststuds i8 fastened in the end plates. The ends of the rod it are providedwith slots l9 and in the slow are mounted stop members 20 and 2| havingcam portions 22 and 23. Springs 24 and 25 secured to the studs i8 areprovided in contact with stop members 29 and 2| to maintain the lattermembers in position to be engaged by roller it.

To provides final adjustment of the stop means without the necessity ofperforming a. filing or similar operation on the co-acting stop members,the traveling member i6 is so arranged that the portion thereof whichengages a stop 20 or M may be changed in shape, or lengthened orshortened preferably in the direction of translation of the member italong the helical member ill. I In the present embodiment of theinvention the travcling member is constituted by a main or wheel portion26 having preferably a threaded central bore 21, as shown in Fig. 4, andmembers movable axially in the bore, preferably bushings 28 and 29screwed into the ends of the bore and provided with tapered ends 30 and3!.

member, and means for adjusting a contact pornection with theaccompanying drawing and its scope will be pointed out in the appendedclaims. Referring to the drawing, Fig. 1 is a plan view Referring now toFig. 2, the stop members 20 and 2|, preferably bell-crank shaped andformed of sheet material, are pivoted, by pins 32, in the slots IQ ofrod l5. Adjacent to the ends of the helical conductor l0, and on theinside of the form ii on which conductor I0 is wound, are mounted, as byscrews 33, stop members 34 each having a lug portion 35 projectingoutwardly of the coil form ll. Stop members 20 and 2i have arm portions.36 and 81 adapted to be swung into the path of and to be engaged by thecorresponding lug portions 35 of the coil form stop members ll.

In operation of the device, upon rotation of the coil form ll carryingthe helical member ID, the roller 16 is translated in the usual manneralong this member. As the roller nears an end of its travel it strikesthe cam arm, as 22, of the corresponding bell-crank shaped stop member20. The latter stop member is thereupon rotated on its pivot, as bestshown at the left-hand end of Fig. 2, to move the other arm, 36, intothe path of the lug portion 35 of the corresponding stop member 34connected to coil form ll, thereby stopping the rotation of the helicalmember HI. The roller member bushing 2!, which makes contact with thecam portion 22 of the stop member 20, is adjusted with reference to thewheel portion 26 until the latter stop member 20 is engaged at exactlythe proper time in the rotation of the helical member Ill. The foregoingoperation is repeated for the stop means at the other end of the helicalmember Hi. The bushings 28 and 29 may then be soldered or otherwisesecured permanently in place on the wheel portion 26.

My invention has been described herein in a particular embodiment forpurposes of illustration. It is to be understood, however, that theinvention is susceptible of various changes and modifications and thatby the appended claims I intend to cover any such modifications as fallwithin the true spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is:

1. In combination, a helical member, means to rotate said member, atraveling member in contact with said helical member and adapted to bemoved thereby longitudinally thereof, and means to stop said helicalmember comprising a member arranged to rotate with said helical memberand means actuated by said traveling member to engage said third-namedmember after a predetermined number of revolutions of member comprisinga member arranged to rotate with said helical member, and means in thepath of said roller to engage said second-named member after apredetermined number of revolut ons of said helical member.

3. In combination, a helical member, a support therefor, means to rotatesaid helical member, a traveling member in contact with said helicalmember and adapted to be moved thereby longitudinally thereof, means tostop said helical member after a predetermined number of revolutionsthereof comprising a member arranged to rotate with said helical member,a member pivoted with respect to said support having a portion adaptedto engage said third-named member and a second portion adapted to beengaged by a portion of said traveling member, and means to vary thelength of said portion of said traveling member.

4. In combination, a rotatable helical member, a roller in contact withsaid member movable thereby longitudinally thereof, means to vary theaxial length of said roller, and means actuated by said roller to stopsaid helical member in a predetermined position when said roller reachesa predetermined turn of said helical member.

5. In combination, a rotatable helical member, a roller in contact withsaid member movable thereby longitudinally thereof, a bushing in saidroller adjustable axially thereof, and means to stop said helical memberin a predetermined position, said means comprising a member having aportion in the path of said bushing and a portion adapted to be engagedby a member rigidly connected to said helical member.

6. In combination, a rotatable helical member, a roller in contact withsaid helical member movable thereby longitudinally thereof, anadjustable bushing in said roller, and means to stop said helical membercomprising a member connected to said helical member and a bellcrankshaped member having one portion in the path of said bushing and anotherportion adapted to engage said second-named member.

EDWARD A. LEACH.

